NEW DELHI (AFP/APP) - Indias premier reassured parliament Friday that there would be no resumption of formal peace talks with Pakistan until Islamabad brings those behind last years Mumbais attacks to justice. The starting point of any meaningful dialogue with Pakistan is a fulfilment of their commitment... not to allow their territory to be used in any manner for terrorist activities against India, Singh told parliament. Sustained effective and credible action needs to be taken not only to bring the perpetrators of the Mumbai attacks to justice, but also to shut down the operation of terrorist groups so as to prevent any future attacks, he said. Despite his assurances that the pre-conditions set by New Delhi for a formal resumption of talks remained in force, the immediate response of opposition MPs was a mass walkout. The opposition had demanded that Singh clarify a joint statement he had issued the day before with his Pakistani counterpart Yousuf Raza Gilani which stated that action on terrorism should not be linked to peace talks. Sections of the Indian media had labelled the statement a major climbdown, with The Mail Today running the frontpage headline PM Sells Out to Pak. The main opposition, the Hindu nationalist Bharatiya Janata Party (BJP), said it remained surprised and disappointed by the apparent policy shift contained in the joint statement. We have conceded, said opposition leader LK Advani, before leading the BJP walkout from the chamber. Singh told members of parliament that Gilani had assured him that Pakistan would do everything in its power to prosecute those responsible. Singh said India seeks cooperative relations with Pakistan and engagement is the only way forward to realise the vision of a stable and prosperous South Asia living in peace and amity. He said India is willing to go more than half way provided Pakistan creates the conditions for a meaningful dialogue. I hope that there is forward movement in the coming months, he said. Singh said during his meeting with Prime Minister Syed Yousuf Raza Gilani on Thursday, they discussed the present condition of India-Pakistan relations, its future potential and the steps that are necessary to enable them to realise the potential. He said he conveyed the strong sentiments of the people of India over the issue of terrorism, especially the terrorist attacks in Mumbai. India is also reviewing the dossier of investigations into these attacks which Pakistan has provided to Delhi, he added. It has been and remains our consistent position that the starting point of any meaningful dialogue with Pakistan is a fulfilment of their commitment, in letter and spirit, not to allow their territory to be used in any manner for terrorist activities against India, Singh told the parliament. He said the Pakistan Prime Minister assured him that Islamabad will do everything in its power to bring the perpetrators of the Mumbai attacks to justice.